CN112092637A - Structure and method for solving braking conflict of electric automobile - Google Patents

Structure and method for solving braking conflict of electric automobile Download PDF

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Publication number
CN112092637A
CN112092637A CN202010893606.8A CN202010893606A CN112092637A CN 112092637 A CN112092637 A CN 112092637A CN 202010893606 A CN202010893606 A CN 202010893606A CN 112092637 A CN112092637 A CN 112092637A
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relay
conflict
braking
triode
voltage main
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CN112092637B (en
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徐兴
林益辉
王峰
刘振宇
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Jiangsu University
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Jiangsu University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B60L7/18—Controlling the braking effect
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L15/00—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles
    • B60L15/20—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed
    • B60L15/2009—Methods, circuits, or devices for controlling the traction-motor speed of electrically-propelled vehicles for control of the vehicle or its driving motor to achieve a desired performance, e.g. speed, torque, programmed variation of speed for braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/42—Drive Train control parameters related to electric machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)

Abstract

The invention provides a structure and a method for solving braking conflict of an electric automobile, and belongs to the field of braking safety of electric automobiles. The structure of the invention is additionally provided with a braking conflict processing module, a broken line detection circuit of the braking conflict processing module is used for judging whether a sensor signal is broken and controlling the on-off of the high-voltage main positive relay, and the braking conflict processing module judges whether a braking conflict exists and controls the on-off of the high-voltage main positive relay; meanwhile, the vehicle control unit judges whether the signal is broken or not or whether the difference of the signals acquired by the front brake sensor and the rear brake sensor is overlarge, and controls the on-off of the high-voltage main and negative relays. The invention adopts a mode of combining software and hardware, can process braking conflict in time, quickly and efficiently, and simultaneously improves the safety and reliability of the electric automobile.

Description

Structure and method for solving braking conflict of electric automobile
Technical Field
The invention belongs to the field of electric automobile braking safety, and particularly relates to a structure and a method for solving electric automobile braking conflict.
Background
With the increasing popularization of electric vehicles, the safety problem of electric vehicles becomes more important, and the brake system of electric vehicles is one of the key factors for determining the safety of electric vehicles, and whether the conflict between the brake execution and the power output of electric vehicles in emergency situations can be well solved is a key factor influencing the safety problem of electric brakes. When a driver encounters an emergency situation requiring braking, emergency braking is usually performed under the condition of power output, so that the problem of brake execution and power output conflict is generated, which is the main problem of electric vehicle brake conflict. Most of the existing electric automobiles are formed by reforming the traditional automobiles, and the brake system is formed by reforming the traditional gasoline automobiles, so that the problem of conflict between brake execution and power output is not properly solved. In the prior art, a low-level brake technology is generally adopted, namely, when a brake signal is detected, power output is directly cut off; the technology is based on a software system, has a simple control structure and lower reliability, and cannot be applied to a complex operating environment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a structure and a method for solving the brake conflict of an electric automobile, when the brake conflict exists, the power output of a power system can be cut off in time by adopting software and hardware for parallel processing, so that the defect of brake conflict caused by the improvement of a gasoline automobile is overcome, the fault tolerance is realized, and the safety and the reliability of the electric automobile are improved.
The present invention achieves the above-described object by the following technical means.
A structure for solving the braking conflict of an electric automobile comprises a braking system, a power system, a vehicle control unit and a braking conflict processing module;
the brake system comprises a front brake pressure sensor and a rear brake pressure sensor, and the front brake pressure sensor and the rear brake pressure sensor are both arranged in a brake pipeline;
the power system comprises a high-voltage main negative relay and a high-voltage main positive relay, wherein the high-voltage main negative relay and the high-voltage main positive relay are both arranged in the battery box, the high-voltage main negative relay is connected with the positive pole of a bus of the battery box, and the high-voltage main positive relay is connected with the negative pole of the bus of the battery box; the battery box is internally provided with a BMS; a Hall current sensor is arranged in the power output cabinet;
the front brake pressure sensor, the rear brake pressure sensor, the high-voltage main negative relay and the Hall current sensor are all connected with the whole vehicle controller;
the front brake pressure sensor, the rear brake pressure sensor, the high-voltage main positive relay and the Hall current sensor are all in conflict with the brake processing module;
the brake conflict processing module comprises a disconnection detection circuit, a signal processing circuit, an internal safety loop and an output signal latch circuit.
In the above technical solution, the disconnection detection circuit is: the input signal of the front brake pressure sensor is connected with the base electrode of the triode QIII, the input signal of the rear brake pressure sensor is connected with the base electrode of the triode QII, and the input signal of the Hall current sensor is connected with the base electrode of the triode QIV; the emitter of the triode QII, the emitter of the triode QIII and the emitter of the triode QIV are all grounded; and a collector electrode of the triode QII is connected with the control end of the relay KII, a collector electrode of the triode QIII is connected with the control end of the relay KIV, and a collector electrode of the triode QIV is connected with the control end of the relay KV.
In the above technical solution, the signal processing circuit is: input signals of the front brake pressure sensor, the rear brake pressure sensor and the Hall current sensor are respectively connected with a positive input end of a comparator, and a negative input end of the comparator is respectively connected with a first reference voltage, a second reference voltage and a third reference voltage; the public output end signal of comparator is connected with triode QI base after the pull-up, and triode QI projecting pole ground connection, triode QI collecting electrode are connected with relay KI's control end, and relay KI common end ground connection, relay KI normally close the end and be connected with relay KIII's control end.
In the technical scheme, the internal safety circuit is formed by serially connecting the relay KII, the relay KIII, the relay KIV and the relay KV in sequence, the public end of the relay KII is grounded, the normally open end of the relay KII is serially connected with the public end of the relay KIII, the normally open end of the relay KIII is serially connected with the public end of the relay KIV, the normally open end of the relay KIV is serially connected with the public end of the relay KV, and the normally open end of the relay KV is connected with the control end of the relay KVII.
In the above technical solution, the output signal latch circuit is: the common terminal of the relay KVII is grounded, the normally open terminal of the electrical appliance KVII is connected with the common terminal I of the relay KVIII, the normally open terminal of the relay KVIII is grounded, the common terminal II of the relay KVIII is grounded, the normally closed terminal of the relay KVIII is connected with the control terminal of the relay KVI, the common terminal of the relay KVI is connected with a 12V electric signal, and the output terminal of the relay KVI is connected with a high-voltage main positive relay.
A method for solving the braking conflict of an electric automobile specifically comprises the following steps:
a disconnection detection circuit of the brake conflict processing module judges whether a sensor signal is disconnected, if the sensor signal is disconnected, an internal safety circuit is disconnected, a high-voltage main positive relay is disconnected, and a power system is disconnected in power output; if the disconnection does not exist, the internal safety loop outputs a low level signal, and the high-voltage main positive relay is closed; meanwhile, the comparator judges whether a braking conflict exists under the condition of power output, when the braking conflict exists, the internal safety circuit is disconnected, the high-voltage main positive relay is disconnected, and the power system disconnects the power output; when no braking conflict exists, the internal safety loop is closed, and the high-voltage main positive relay is closed;
the vehicle control unit judges whether the signal has a broken line or whether the signal difference acquired by the front and rear brake sensors meets the absolute value of UFront side-URear end| is more than or equal to 0.2V, if the wire is broken or | U is satisfiedFront side-URear endIf the voltage is more than or equal to 0.2V, the whole vehicle controller interrupts the power-on signal output, the high-voltage main and negative relays are disconnected, and the power output of the power system is interrupted; otherwise, judging whether a braking conflict exists under the condition of power output, and stopping the power-on signal output of the whole vehicle controller on the high-voltage main and negative relay when the braking conflict exists, disconnecting the high-voltage main and negative relay and disconnecting the power output of the power system; when no braking conflict exists, the vehicle control unit outputs a power-on signal to the high-voltage main and negative relay, and the high-voltage main and negative relay is closed;
when one of the high-voltage main negative relay and the high-voltage main positive relay of the power system is disconnected, the power system can interrupt power output;
when the high-voltage main negative relay and the high-voltage main positive relay are closed simultaneously, the power system can realize power output.
Further, the braking conflict of the braking conflict processing module is judged according to the following conditions: the comparator compares the pressure value acquired by the front brake pressure sensor with the first reference voltage, compares the pressure value acquired by the rear brake pressure sensor with the second reference voltage, and compares the current value acquired by the Hall current sensor with the third reference voltage, when more than one pressure value acquired by the brake pressure sensor is greater than the first reference voltage and the current value acquired by the Hall current sensor is greater than the third reference voltage, the brake conflict is judged, otherwise, the brake conflict does not exist.
Further, when the disconnection detection circuit judges whether the sensor signal is disconnected, the on-off of the internal safety loop is realized: the on-off of the relay KII, the relay KIV and the relay KV are controlled by the on-off of the triode QII, the triode QIII and the triode QIV, and then the on-off of the relay KVI is controlled.
Furthermore, when the comparator judges whether a braking conflict exists, the on-off of the internal safety loop is realized by sequentially controlling the triode QI, the relay KI and the relay KIII through the output signal of the comparator.
Further, the braking conflict of the vehicle control unit is judged according to the following conditions: the vehicle controller simultaneously compares the pressure value acquired by the front brake pressure sensor with the reference voltage IV, compares the pressure value acquired by the rear brake pressure sensor with the reference voltage V, and compares the current value acquired by the Hall current sensor with the reference voltage VI, and when more than one pressure value acquired by the brake pressure sensor is greater than the reference voltage and the current value acquired by the Hall current sensor is greater than the reference voltage VI, the vehicle controller judges that a brake conflict exists, otherwise, the vehicle controller does not exist the brake conflict.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, a disconnection detection circuit of a brake conflict processing module is used for judging whether a signal is disconnected, if so, a high-voltage main positive relay is disconnected, and if not, the high-voltage main positive relay is closed; a comparator of the braking conflict processing module judges whether the sensor signal is greater than a reference voltage so as to judge whether braking conflict exists, when the braking conflict exists, the high-voltage main positive relay is switched off, and when the braking conflict does not exist, the high-voltage main positive relay is switched on;
the vehicle control unit also judges whether the signal has a broken line or whether the difference of the signals collected by the front and rear brake sensors is overlarge, and if the broken line or the difference is overlarge, the high-voltage main and negative relays are disconnected; otherwise, the vehicle control unit judges whether the sensor signal is greater than the reference voltage so as to judge whether a braking conflict exists, when the braking conflict exists, the high-voltage main and negative relay is switched off, and when the braking conflict does not exist, the high-voltage main and negative relay is switched on;
when one of the high-voltage main negative relay and the high-voltage main positive relay of the power system is disconnected, the power system can interrupt power output, so that the function of cutting off the power system output when the brake conflicts with the power output is realized; only when the high-voltage main negative relay and the high-voltage main positive relay are closed simultaneously, the power system can realize power output, so that the electric automobile can normally run.
The invention adopts a mode of combining software and hardware, can process in time when braking conflict exists, and has high response speed and high execution efficiency of the system; and a dual redundant signal processing form is adopted, so that the stability and the reliability are higher.
Drawings
FIG. 1 is a schematic structural diagram of the electric vehicle braking conflict resolution method according to the invention;
FIG. 2 is a schematic circuit diagram of a brake collision processing module according to the present invention;
FIG. 3 is a flow chart of a method for resolving braking conflict of an electric vehicle according to the present invention;
FIG. 4 is a flow chart of the braking conflict processing module according to the present invention for processing the existence of braking conflict and the nonexistence of braking conflict;
in the figure: 1-vehicle control unit (ECU); 2-brake pipe; 3-a brake pedal; 4-front brake pressure sensor; 5-a brake conflict processing module; 6-rear brake pressure sensor; 7-high voltage main and negative relays; 8-high voltage main positive relay; 9-a battery box; 10-hall current sensor; 11-a power take-off cabinet; 12-resistance one; 13-resistance two; 14-comparator output one; 15-comparator output two; 16-comparator output three; 17-pull-up resistance; 18-a comparator common output; 19-triode QI base resistance; 20-triode QI base; 21-triode QI emitter; 22-triode QI collector; 23-relay KI control end; 24-relay KI common; 25-normally closed end of relay KI; 26-a relay KI; 27-reference voltage one; 28-reference voltage two; 29-reference voltage three; 30-a comparator; 31-relay KII common; 32-normally open end of relay KII; 33-resistance three; 34-relay KIII common; 35-normally open end of relay KIII; 36-triode QII base; 37-triode QII emitter; 38-triode QII collector; 39-relay KII control end; 40-relay KII; 41-relay KIII control end; 42-relay KIII; 43-relay KIV common; 44-normally open end of relay KIV; 45-relay KV common terminal; 46-KV normally open end of relay; 47-triode QIII base; 48-triode QIII emitter; 49-triode QIII collector; 50-relay KIV control terminal; 51-relay KIV; 52-triode QIV base; 53-triode QIV emitter; 54-triode QIV collector; 55-KV relay control terminal; 56-relay KVI common; 57-output terminal of KVI relay; 58-common terminal one of relay KVIII; 59-relay KVIII common terminal two; 60-relay KVIII normally open end; 61-relay KVIII normally closed terminal; 62-relay KVII common; 63-normally open end of relay kvi; 64-Relay KVI; 65-control terminal of relay KVI; 66-relay KVIII; 67-relay KVII; 68-control end of relay KVII; 69-Relay KV; 70-BMS.
Detailed Description
The invention will be further described with reference to the following figures and specific examples, but the scope of the invention is not limited thereto.
As shown in fig. 1, a structure for solving a braking conflict of an electric vehicle includes a braking system, a power system, a vehicle control unit 1 and a braking conflict processing module 5.
The brake system comprises a brake pipeline 2 and a brake pedal 3, wherein the brake pedal 3 is connected to a brake main cylinder through a push rod, the brake main cylinder is respectively connected to a front brake caliper and a rear brake caliper through the brake pipeline 2, and a front brake pressure sensor 4 and a rear brake pressure sensor 6 are arranged in the brake pipeline 2.
The power system comprises a high-voltage main negative relay 7 and a high-voltage main positive relay 8, the high-voltage main negative relay 7 and the high-voltage main positive relay 8 are arranged inside a battery box 9, a BMS70 is further arranged inside the battery box 9, and a BMS70 is connected with the control ends of the high-voltage main negative relay 7 and the high-voltage main positive relay 8; the high-voltage main negative relay 7 and the high-voltage main positive relay 8 are respectively connected with the positive electrode and the negative electrode of the bus of the battery box 9 and are used for controlling the on-off of the positive electrode and the negative electrode of the bus of the battery box 9; the battery box 9 is connected to the power output cabinet 11 through a high-voltage wire, a Hall current sensor 10 is arranged inside the power output cabinet 11, the Hall current sensor 10 is used for measuring the positive bus current of the battery box 9, and the power output cabinet 11 is further connected with a motor controller through a high-voltage wire.
The front brake pressure sensor 4, the rear brake pressure sensor 6, the high-voltage main negative relay 7 and the Hall current sensor 10 are all connected with the vehicle control unit 1 through low-voltage wiring harnesses.
The front brake pressure sensor 4, the rear brake pressure sensor 6, the high-voltage main positive relay 8 and the Hall current sensor 10 are all connected with the brake conflict processing module 5 through low-voltage wire harnesses.
As shown in fig. 2, the brake collision processing module 5 internally includes a disconnection detection circuit, a signal processing circuit, an internal safety loop, and an output signal latch circuit.
In the disconnection detection circuit, an input signal of the front brake pressure sensor 4 is connected with a base 47 of a triode QIII through a first resistor 12, an input signal of the rear brake pressure sensor 6 is connected with a base 36 of the triode QII through a second resistor 13, and an input signal of the Hall current sensor 10 is connected with a base 52 of the triode QIV through a third resistor 33; the triode QII emitter 37, the triode QIII emitter 48 and the triode QIV emitter 53 are all grounded; and a collector 38 of the triode QII is connected with the control end 39 of the relay KII40, a collector 49 of the triode QIII is connected with the control end 50 of the relay KIV51, and a collector 54 of the triode QIV is connected with the control end 55 of the relay KV 69.
In the signal processing circuit, input signals of the front brake pressure sensor 4, the rear brake pressure sensor 6 and the Hall current sensor 10 are respectively connected with a positive input end of a comparator 30, and a negative input end of the comparator 30 is respectively connected with a first reference voltage 27, a second reference voltage 28 and a third reference voltage 29; the first comparator output 14, the second comparator output 15 and the third comparator output 16 are combined together to form a common comparator output end 18, the common comparator output end 18 is connected with a pull-up resistor 17, signals are connected with a triode QI base 20 through a triode QI base resistor 19 after being pulled up, a triode QI emitter 21 is grounded, a triode QI collector 22 is connected with a control end 23 of a relay KI26, a common relay KI end 24 is grounded, and a normally closed relay KI end 25 is connected with a control end 41 of a relay KIII 42.
The internal safety loop circuit is formed by sequentially connecting a relay KII40, a relay KIII42, a relay KIV51 and a relay KV69 in series, wherein the common end 31 of the relay KII is grounded, the normally open end 32 of the relay KII is connected with the common end 34 of the relay KIII in series, the normally open end 35 of the relay KIII is connected with the common end 43 of the relay KIV in series, the normally open end 44 of the relay KIV is connected with the common end 45 of the relay KV in series, and the normally open end 46 of the relay KV is connected with the control end 68 of the relay KVII 67.
In the signal latch circuit, a relay KVII public end 62 is grounded, an electrical appliance KVII normally open end 63 is connected with a public end 58 of a relay KVI66, a relay KVIII normally open end 60 is grounded, a relay KVIII public end two 59 is grounded, a relay KVIII normally closed end 61 is connected with a relay KVI control end 65, a relay KVI public end 56 is connected with a 12V electric signal, and a relay KVI output end 57 is connected with a high-voltage main positive relay 8.
In the invention, a relay KI26, a relay KII40, a relay KIII42, a relay KIV51, a relay KV69, a relay KVII67 and a relay KVI64 are all latching five-pin relays, a relay KVI64 is used as an electrifying relay, and a relay KVIII is a latching eight-pin relay; the triodes QI, QII, QIII and QIV are NPN triodes.
As shown in fig. 3, a method for solving a braking conflict of an electric vehicle specifically includes:
when a driver steps on the brake pedal 3, the pressure of a brake pipeline changes, and the brake conflict processing module 5 receives brake pipeline pressure signals collected by the front brake pressure sensor 4 and the rear brake pressure sensor 6 and current signals collected by the Hall current sensor 10; the disconnection detection circuit judges whether the signal is disconnected or not, if the signal is disconnected (at least one disconnected line exists), the disconnected sensor causes that a triode QII collector 38 or a triode QIII collector 49 or a triode QIV collector 54 cannot drive a relay KII40, a relay KIV51 and a relay KV69 to be closed, a relay KVI64 is disconnected, the high-voltage main positive relay 8 cannot receive a 12V electrifying signal output by the braking conflict processing module 5, the high-voltage main positive relay 8 is disconnected, and the power system disconnects power output; if the disconnection does not exist, the triode QII, the triode QIII and the triode QIV drive the corresponding relays to be closed, the internal safety loop outputs a low level signal (the internal safety loop is closed), the relay KVI64 provides a 12V power-on signal for the high-voltage main positive relay 8, and the high-voltage main positive relay 8 is closed (see fig. 4); the comparator 30 compares the pressure value collected by the front brake pressure sensor 4 with the first reference voltage 27, compares the pressure value collected by the rear brake pressure sensor 6 with the second reference voltage 28, compares the current value collected by the hall current sensor 10 with the third reference voltage 29, determines that there is brake conflict under the condition of power output when more than one pressure value collected by the brake pressure sensor is greater than the second reference voltage and the current value collected by the hall current sensor is greater than the third reference voltage, the disconnection detection circuit is closed and the comparator 30 outputs a suspension signal, the output signal drives the triode QI after being pulled up, the triode QI drives the relay KI26 to be closed, the relay KIII42 is disconnected, the internal safety circuit outputs the suspension signal (the internal safety circuit is disconnected), so that the 12V power-on signal output by the conflict module 5 cannot be received by the high-voltage main positive relay 8, the high-voltage main positive relay 8 is disconnected, and the power system disconnects power output; when no braking conflict exists, the comparator 30 outputs a low level signal, the triode QI cannot be driven, the triode QI cannot drive the relay KI26 to be closed, the relay KIII42 is closed, the internal safety circuit outputs a low level signal, the high-voltage main positive relay 8 receives a 12V power-on signal, and the high-voltage main positive relay 8 is closed (see fig. 4).
Meanwhile, the vehicle control unit 1 receives the current output value and the front and rear braking pressure values of the power system and judges the informationWhether the signal has broken line or whether the difference between the signals collected by the front and the rear brake sensors is too large (namely | U)Front side-URear end| is more than or equal to 0.2V), if there is a broken line or the difference is too large (satisfying | U)Front side-URear end| ≧ 0.2V), directly entering a conflict state: the whole vehicle controller 1 interrupts the power-on signal output, the high-voltage main and negative relay 7 is disconnected, and the power output of the power system is interrupted; otherwise, the vehicle control unit 1 simultaneously compares the pressure value acquired by the front brake pressure sensor 4 with the reference voltage four, compares the pressure value acquired by the rear brake pressure sensor 6 with the reference voltage five, and compares the current value acquired by the hall current sensor 10 with the reference voltage six, when more than one pressure value acquired by the brake pressure sensor is greater than the reference voltage and the current value acquired by the hall current sensor is greater than the reference voltage six, it is judged whether a brake conflict exists under the condition of power output, if the brake conflict exists, the vehicle control unit 1 stops outputting the 12V power-on signal of the high-voltage main negative relay 7 and keeps the state, so that the high-voltage main negative relay 7 is always kept disconnected, and the power output of the power system is always interrupted; when one of the high-voltage main negative relay 7 and the high-voltage main positive relay 8 of the power system is disconnected, the power system can interrupt power output, and the function of cutting off the power system output when the brake conflicts with the power output is realized; when no braking conflict exists, the vehicle control unit 1 outputs a 12V power-on signal to control the high-voltage main negative relay 7 to be closed, and only when the high-voltage main negative relay 7 and the high-voltage main positive relay 8 are closed simultaneously, the power system can realize power output, so that the electric vehicle can normally run; the BMS70 controls the other control ends of the high-voltage main positive relay 8 and the high-voltage main negative relay 7, so that the high-voltage main positive relay 8 and the high-voltage main negative relay 7 can be normally closed only when the battery box 9 works normally, and the safety of the whole vehicle is guaranteed; wherein, the four, five and six reference voltages are all arranged in the vehicle control unit 1.
The present invention is not limited to the above-described embodiments, and any obvious improvements, substitutions or modifications can be made by those skilled in the art without departing from the spirit of the present invention.

Claims (10)

1. A structure for solving the braking conflict of an electric automobile is characterized by comprising a braking system, a power system, a vehicle control unit (1) and a braking conflict processing module (5);
the brake system comprises a front brake pressure sensor (4) and a rear brake pressure sensor (6), wherein the front brake pressure sensor (4) and the rear brake pressure sensor (6) are arranged in the brake pipeline (2);
the power system comprises a high-voltage main negative relay (7) and a high-voltage main positive relay (8), wherein the high-voltage main negative relay (7) and the high-voltage main positive relay (8) are arranged inside a battery box (9), the high-voltage main negative relay (7) is connected with the positive pole of a bus of the battery box (9), and the high-voltage main positive relay (8) is connected with the negative pole of the bus of the battery box (9); a BMS (70) is also arranged in the battery box (9); a Hall current sensor (10) is arranged in the power output cabinet (11);
the front brake pressure sensor (4), the rear brake pressure sensor (6), the high-voltage main negative relay (7) and the Hall current sensor (10) are all connected with the whole vehicle controller (1);
the front brake pressure sensor (4), the rear brake pressure sensor (6), the high-voltage main positive relay (8) and the Hall current sensor (10) are all in conflict with the brake processing module (5);
the brake conflict processing module (5) comprises a disconnection detection circuit, a signal processing circuit, an internal safety loop and an output signal latch circuit.
2. The structure for solving the braking conflict of the electric automobile according to claim 1, wherein the disconnection detecting circuit is: the input signal of the front brake pressure sensor (4) is connected with a triode QIII base (47), the input signal of the rear brake pressure sensor (6) is connected with a triode QII base (36), and the input signal of the Hall current sensor (10) is connected with a triode QIV base (52); the triode QII emitter (37), the triode QIII emitter (48) and the triode QIV emitter (53) are all grounded; and a collector electrode (38) of the triode QII is connected with a control end (39) of the relay KII (40), a collector electrode (49) of the triode QIII is connected with a control end (50) of the relay KIV (51), and a collector electrode (54) of the triode QIV is connected with a control end (55) of the relay KV (69).
3. The structure for solving the braking conflict of the electric automobile according to claim 1, wherein the signal processing circuit is: input signals of the front brake pressure sensor (4), the rear brake pressure sensor (6) and the Hall current sensor (10) are respectively connected with a positive input end of a comparator (30), and a negative input end of the comparator (30) is respectively connected with a first reference voltage (27), a second reference voltage (28) and a third reference voltage (29); the signal of the common output end (18) of the comparator is connected with a triode QI base electrode (20) after being pulled up, a triode QI emitting electrode (21) is grounded, a triode QI collecting electrode (22) is connected with a control end (23) of a relay KI (26), a common end (24) of the relay KI is grounded, and a normally closed end (25) of the relay KII is connected with a control end (41) of a relay KIII (42).
4. The structure for solving the braking conflict of the electric automobile according to claim 1, wherein the internal safety loop is formed by sequentially connecting a relay KII (40), a relay KIII (42), a relay KIV (51) and a relay KV (69) in series, a common end (31) of the relay KII (40) is grounded, a normally open end (32) of the relay KII (40) is connected with a common end (34) of the relay KIII (42) in series, a normally open end (35) of the relay KIII (42) is connected with a common end (43) of the relay KIV (51) in series, a normally open end (44) of the relay KIV (51) is connected with a common end (45) of the relay KV (69) in series, and a normally open end (46) of the relay KV (69) is connected with a control end (68) of the relay KVII (67).
5. The structure for solving the braking conflict of the electric automobile according to claim 1, wherein the output signal latch circuit is: the common end (62) of the relay KVII (67) is grounded, the normally open end (63) of the electrical appliance KVII (67) is connected with the common end I (58) of the relay KVIII (66), the normally open end (60) of the relay KVIII (66) is grounded, the common end II (59) of the relay KVIII (66) is grounded, the normally closed end (61) of the relay KVIII (66) is connected with the control end (65) of the relay KVI (64), the common end (56) of the relay KVI (64) is connected with a 12V electric signal, and the output end (57) of the relay KVI (64) is connected with the high-voltage main positive relay (8).
6. A method for resolving electric vehicle braking conflict according to any one of claims 1-5, characterized in that:
a broken line detection circuit of the brake conflict processing module (5) judges whether a sensor signal has broken line, if the broken line exists, an internal safety circuit is disconnected, a high-voltage main positive relay (8) is disconnected, and a power system disconnects power output; if the disconnection does not exist, the internal safety loop outputs a low level signal, and the high-voltage main positive relay (8) is closed; meanwhile, the comparator (30) judges whether a braking conflict exists under the condition of power output, when the braking conflict exists, the internal safety circuit is disconnected, the high-voltage main positive relay (8) is disconnected, and the power system disconnects the power output; when no braking conflict exists, the internal safety loop is closed, and the high-voltage main positive relay (8) is closed;
the vehicle control unit (1) judges whether the signal is broken or whether the signal difference acquired by the front and rear brake sensors meets the requirement of | UFront side-URear end| is more than or equal to 0.2V, if the wire is broken or | U is satisfiedFront side-URear endIf the voltage is more than or equal to 0.2V, the whole vehicle controller (1) interrupts the output of the power-on signal, the high-voltage main and negative relay (7) is disconnected, and the power output of the power system is interrupted; otherwise, judging whether a braking conflict exists under the condition of power output, and stopping the power-on signal output of the whole vehicle controller (1) to the high-voltage main and negative relay (7) when the braking conflict exists, disconnecting the high-voltage main and negative relay (7) and disconnecting the power output of the power system; when no braking conflict exists, the vehicle control unit (1) outputs an electrifying signal to the high-voltage main negative relay (7), and the high-voltage main negative relay (7) is closed;
when one of the high-voltage main negative relay (7) and the high-voltage main positive relay (8) of the power system is disconnected, the power system can interrupt power output;
when the high-voltage main negative relay (7) and the high-voltage main positive relay (8) are closed simultaneously, the power system can realize power output.
7. The method for solving the braking conflict of the electric vehicle according to claim 6, wherein the braking conflict of the braking conflict processing module (5) is judged according to the following conditions: the comparator (30) compares the pressure value collected by the front brake pressure sensor (4) with the first reference voltage (27), compares the pressure value collected by the rear brake pressure sensor (6) with the second reference voltage (28), compares the current value collected by the Hall current sensor (10) with the third reference voltage (29), and judges that a brake conflict exists when more than one pressure value collected by the brake pressure sensor is greater than the first reference voltage and the current value collected by the Hall current sensor is greater than the third reference voltage, otherwise, the brake conflict does not exist.
8. The method for solving the braking conflict of the electric automobile according to claim 6, wherein when the disconnection detection circuit judges whether the sensor signal is disconnected, the on-off of the internal safety loop is realized: the on-off of the triode QII, the triode QIII and the triode QIV further control the on-off of the relay KII (40), the relay KIV (51) and the relay KV (69), and then control the on-off of the relay KVI (64).
9. The method for solving the braking conflict of the electric vehicle according to claim 6, wherein when the comparator (30) judges whether the braking conflict exists, the comparator (30) outputs a signal to switch on and off the internal safety loop, and the triode QI, the relay KI (26) and the relay KIII (42) are sequentially controlled to realize the switching on and off of the internal safety loop.
10. The method for solving the braking conflict of the electric vehicle according to claim 6, wherein the braking conflict of the vehicle control unit (1) is determined according to the following conditions: the vehicle control unit (1) compares the pressure value collected by the front brake pressure sensor (4) with the reference voltage IV, compares the pressure value collected by the rear brake pressure sensor (6) with the reference voltage V, and compares the current value collected by the Hall current sensor (10) with the reference voltage VI, when more than one pressure value collected by the brake pressure sensor is greater than the reference voltage and the current value collected by the Hall current sensor is greater than the reference voltage VI, the brake conflict is judged, otherwise, the brake conflict does not exist.
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